[llvm] [VPlan] Implement cloning of VPlans. (PR #73158)

[via llvm-commits]

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@@ -982,6 +994,65 @@ void VPlan::updateDominatorTree(DominatorTree *DT, BasicBlock *LoopHeaderBB,
   assert(DT->verify(DominatorTree::VerificationLevel::Fast));
 }
 
+static void remapVPValues(VPBasicBlock *OldBB, VPBasicBlock *NewBB,
+                          DenseMap<VPValue *, VPValue *> &Old2NewVPValues,
+                          bool Full = false) {
+  for (const auto &[OldR, NewR] : zip(*OldBB, *NewBB)) {
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ayalz wrote:

nit: worth asserting OldR and NewR have same number of operands and defs?

https://github.com/llvm/llvm-project/pull/73158